<template>
    <div>
        <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 2. 为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
    </div>
</template>
<script>
//1.导入echarts
import echarts from 'echarts'
//导入lodash    
import _ from 'lodash'
export default {
    data () {
        return {
            // 需要合并的数据
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
        }
    },
    //调用mounted钩子函数时页面上的元素已经渲染完毕了
    async mounted () {
        //3.基于准备好的dom初始化echarts实例
        let myChart = echarts.init(document.getElementById('main'))

        const {data:res} = await this.$http.get('reports/type/1')
        if (res.meta.status !== 200) {
            return this.$message.error('获取折线图数据失败!')
        }
        //4.准备数据和配置项
        const result = _.merge(res.data,this.options)
        //5.展示数据 将数据添加到echarts实例上
        myChart.setOption(result)
    }
}
</script>
<style lang="less" scoped>

</style>